12.19 Power Management Control and Status Register

The power management control and status register implements the control and status of the SD host controller. This register is not affected by the internally generated reset caused by the transition from the D3hot to D0 state. See Table 12−14 for a complete description of the register contents.

Bit

15

 

14

 

13

 

12

 

 

11

10

9

8

 

7

 

6

 

5

4

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

 

 

 

 

 

Power management control and status

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RCU

 

R

 

R

 

R

 

 

 

R

R

R

 

RW

 

R

 

R

 

R

R

R

 

R

RW

RW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

0

 

0

 

0

 

 

0

0

0

0

 

0

 

0

 

0

0

0

 

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Power management control and status

 

 

 

 

 

 

 

 

 

 

 

 

Offset:

 

 

84h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

 

Read/Clear, Read/Write, Read-only

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

0000h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 12−14. Power Management Control and Status Register Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

 

FIELD NAME

 

TYPE

 

 

 

 

 

 

 

 

 

 

 

 

DESCRIPTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15 ‡

 

PME_STAT

 

RCU

 

 

 

 

 

status. This bit defaults to 0.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PME

 

 

 

 

 

 

 

 

 

 

 

 

14−13

 

DATA_SCALE

 

R

 

 

Data scale. This field returns 0s when read, because the SD host controller does not use the data

 

 

 

 

 

 

 

 

 

 

 

register.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12−9

 

DATA_SELECT

 

R

 

 

Data select. This field returns 0s when read, because the SD host controller does not use the data

 

 

 

 

 

 

 

 

 

 

 

register.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8 ‡

 

PME_EN

 

RW

 

 

 

 

 

enable. Enables

 

 

signaling.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PME

PME

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7−2

 

RSVD

 

R

 

 

Reserved. Bits 7−2 return 0s when read.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1−0 ‡

 

PWR_STATE

 

RW

 

 

Power state. This 2-bit field determines the current power state and sets the SD host controller to a

 

 

 

 

 

 

 

 

 

 

 

new power state. This field is encoded as follows:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00 = Current power state is D0.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01 = Current power state is D1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 = Current power state is D2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11 = Current power state is D3hot.

 

 

 

 

 

 

 

 

 

 

 

One or more bits in this register are cleared only by the assertion of GRST.

12.20 Power Management Bridge Support Extension Register

The power management bridge support extension register provides extended power-management features not applicable to the SD host controller; thus, it is read-only and returns 00h when read.

Bit

 

7

6

5

4

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

Power management bridge support extension

 

 

 

 

 

 

 

 

 

 

 

 

Type

 

R

R

R

R

R

R

 

R

R

 

 

 

 

 

 

 

 

 

 

 

Default

 

0

0

0

0

0

0

 

0

0

 

 

 

 

 

 

 

 

 

 

 

Register:

Power management bridge support extension

 

Offset:

86h

 

 

 

 

 

 

 

 

Type:

Read-only

 

 

 

 

 

 

 

Default:

00h

 

 

 

 

 

 

 

12−13

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Image 267
Texas Instruments PCI7421, PCI7411 Power management bridge support extension, Register, Enable. Enables Signaling, 12−13